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        //  1.算术运算符：加减乘除  取余%；
        var num=45;
        var num2=6;
        console.log(num2-num);
        console.log(num % num2);
        // 2.失真:数据线转化为二进制然后才能运算结果在转化为十进制
        console.log(0.1+0.2);
        console.log(0.07*100);
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